Texas Instruments TPS7A1509PDRVR

Overview

TPS7A1509PDRVR from Texas Instruments is a 400-mA ultra-low-dropout linear regulator (LDO) optimized for battery-powered systems requiring sub-1-V input and 0.9-V fixed output. It operates with VIN as low as 0.7 V, achieves 80 mV max dropout at 400 mA, maintains ±1% output accuracy over load/line/temperature, and delivers 84 dB PSRR at 1 kHz - enabling stable power delivery in compact camera modules and wearables.

For engineers reviewing the TPS7A1509PDRVR datasheet, TPS7A1509PDRVR pinout, TPS7A1509PDRVR application, or TPS7A1509PDRVR equivalent, key selection criteria include its LILO (low-input, low-output) architecture, dual-rail biasing (IN + BIAS), active output discharge, SENSE feedback capability, and WSON-6 package thermal performance.

Technical Context

The TPS7A1509PDRVR uses a dual-supply architecture: the IN pin carries the main power path (down to 0.7 V), while the BIAS pin (2.2–5.5 V) powers internal reference and control circuitry - decoupling regulation stability from ultra-low VIN constraints. This enables operation with VIN = VOUT + 100 mV and full specification compliance under those conditions.

It integrates foldback current limiting (ICL = 450–1100 mA, ISC = 270 mA), thermal shutdown (165°C trip, 140°C reset), global UVLO on both IN (603 mV typ rising) and BIAS (1.42 V typ rising), and an active pulldown circuit (RPULLDOWN = 36 Ω) for rapid output discharge during disable.

Key Specifications

Pinout & Package

TPS7A1509PDRVR is packaged in a 2-mm × 2-mm, 6-pin WSON (DRV) with exposed thermal pad electrically tied to GND - optimized for PCB heat spreading in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-input, low-output LDO applications.

Compared with TPS7A1509PDRVR, TPS7A1601DQNR trades LILO flexibility for simpler layout, while NCP163AMX09R2G sacrifices PSRR, dropout, and discharge features for lower unit cost - making TPS7A1509PDRVR the only option meeting all three: sub-1-V IN, 0.9-V OUT, and active discharge in WSON.

Availability

TPS7A1509PDRVR is available at Aetrix Electronics and suitable for camera modules, wireless earbuds, and smart watches requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS7A1509PDRVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of LDO innovation focused on power efficiency, miniaturization, and reliability.

The TPS7A15 family was designed specifically for ultra-low-voltage, high-transient applications in portable electronics - addressing the need for efficient, accurate, and compact regulation where traditional LDOs fail due to VIN–VOUT headroom limitations.

FAQ

What is the minimum input voltage required for TPS7A1509PDRVR to regulate 0.9 V?

The TPS7A1509PDRVR regulates 0.9 V with input as low as 0.7 V, enabled by its dual-rail architecture: the IN pin supplies the pass element while the BIAS pin (≥2.2 V) powers internal circuitry. Full specifications - including 80 mV dropout and ±1% accuracy - are guaranteed when VIN ≥ VOUT + 100 mV (i.e., ≥1.0 V), but functional regulation begins at 0.7 V.

Does TPS7A1509PDRVR require an external resistor network to set output voltage?

No. TPS7A1509PDRVR is a fixed-output device delivering precisely 0.9 V - no external resistors are needed. This simplifies layout, eliminates resistor tolerance errors, and ensures consistent output across temperature and load. The "09" in the part number explicitly denotes the 0.9-V variant within the TPS7A15 family.

How does the SENSE pin improve regulation accuracy in TPS7A1509PDRVR?

The SENSE pin on TPS7A1509PDRVR provides remote feedback by connecting directly to the load's power input node. This compensates for voltage drop across PCB traces between the OUT pin and load, maintaining ±1% regulation accuracy at the point of use - critical for noise-sensitive analog circuits like image sensors or high-speed SerDes.

Can TPS7A1509PDRVR operate without the BIAS supply connected?

No. The BIAS pin must be supplied with 2.2–5.5 V for TPS7A1509PDRVR to function. It powers the internal bandgap reference, error amplifier, and control logic. If BIAS is unpowered or below UVLO (1.42 V rising), the global UVLO disables the device regardless of IN or EN state - ensuring predictable, safe startup sequencing.

What thermal considerations apply to TPS7A1509PDRVR in the DRV (WSON) package?

In the 2-mm × 2-mm WSON package, TPS7A1509PDRVR has RθJA = 75.7°C/W with proper PCB copper pour on the thermal pad. To maintain TJ ≤ 125°C at 400 mA and 100-mV dropout (40 mW dissipation), ambient temperature must stay below ~95°C - achievable with ≥1-in² 2-oz copper area under the thermal pad and minimal airflow.